Two issues I see here, one not necessarily critical but a very bad habit, and the other the cause of your problem.
For the problem, you are using resource field tags [[*id]] and [[*pagetitle]]. So this will give you those values for the current page... the page that has the snippet calls on it. You need to use placeholder tags [[+id]] and [[+pagetitle]] tags to get the values that the snippets have for each item they are listing.
The bad habit is how you are using the snippet tags. It is better to use them like this
[[getResources? &showHidden=`1` &parents=`13` &tpl=`myTpl` &includeContent=`1`]]
While the way you have it will work, if there happen to be any spaces in the values then it will break.